K
- Tim Kaine - governor of Virginia (Rockhurst High School in Kansas City, Missouri)
- Sebastian Kappen, S.J. - Jesuit priest and liberation theologian (Gregorian University in Rome)
- General John "Jack" Keane - retired four-star General and former Vice Chief of Staff of the United States Army (Fordham University)
- John Kerry - US Senator, 2004 Democratic Presidential Candidate (Boston College, Chestnut Hill, MA)
- John Keegan - English military historian (Wimbledon College)
- Bob Keeshan - American actor (Fordham University)
- Bohdan Khmelnytsky - Cossack leader (educated by the Jesuits in L'vov, Ukraine)
- Eusebio Kino - Tyrolian Jesuit missionary explorer of present day California, Arizona and Sonora (University of Ingolstadt)
- Athanasius Kircher - German Jesuit scholar and polymath (Jesuit College in Fulda)
- Curt Kirkwood - American singer in the musical group The Meat Puppets (Brophy College Preparatory in Phoenix, Arizona)
- Peter Hans Kolvenbach - Superior General of the Society of Jesus (Canisius College, Nijmegen, The Netherlands)
- Hans Küng - Swiss Catholic priest, author and theologian (Gregorian University in Rome, Italy)
Read more about this topic: List Of Alumni Of Jesuit Educational Institutions